The Sanskrit word "Sundara" literally means "beautiful" and these new planar magnetic headphones fit this description in every way. Ultra thin diaphragm, all planar headphones inherited advanced hi-fi technology for men with newly developed diaphragm which is 80% thinner than the HE400 series, resulting in a wider frequency response, faster and detailed hybrid headband design. With the weight extension strap for exceptional comfort, but with a more fashionable look with its sleek and sumptuous matte black finish. Form follows function: with its metal headband, the SUNDARA is designed to withstand the rigors of urban street life. The SUNDARA is as durable as it is beautiful. New 3. 5mm headphone jack for durability Pocket powered performance. The slim Supermini line is perfect for SUNDARA's companion. The Supermini with its abundance of audio power and the grace and balance of SUNDARA make it the velvet glove on a marble handle. Technical specifications: Frequency response: 6 Hz - 75 kHz. Impedance: 37 ohms Sensitivity: 94dB Weight: 372 g